A few things that could have made an okay a movie from the kick ass series.
gotten marshal arts masters to play the main bending characters.
split the first book into two movies. Then they could have included all the important things the air temple the inventor.
MORE AND FUNNYER LINES FROM SOKKA AANG AND IROH!
A professorial make up artiest for Zuko.
The lead writers from the series
A director without his head up his ass.

How about we just burn the movie and act like it never happened.
You can't just pick out of a few things in that movie and make it better. M Night did a pretty thorough job in making sure the whole film was a piece of ****. Its beyond help.